import time
person_list = ['Rachel', 'Monica', 'Ross', 'Joey']
def ask_way(people_list):
    print('-'*60)
    if len(people_list) == 0:
        return '没人知道'
    person = people_list.pop(0)
    if person == 'Ross':
        return '%s说:我知道,流水人家就在小桥旁' % person
    print('hi 亲爱的%s,知道流水人家在哪里吗？' % person)
    print('%s回答道:抱歉，我不知道，我帮你问问%s...' % (person, person_list))
    time.sleep(3)
    res = ask_way(person_list)
    print('%s问的结果是: %res' % (person, res))
    return res


res = ask_way(person_list)
print(res)
